CN200968428Y - Reversible turning structure of butterfly valve butterfly plate - Google Patents

Abstract

The purpose of the reversible rotary structure of the butterfly plate of the butterfly valve is to make the butterfly plate turn to the closed position when the butterfly plate is in the open position, reduce the deformation of the butterfly valve, and form a large enough frictional moment to overcome the hydrodynamic moment of the fluid. The hand wheel 1 is installed on the upper end of the valve stem 8, the valve stem 8 is installed in the valve body 1' through a bushing assembly, and the inclined bushing 4 is fastened to the butterfly plate wheel by the locknut 2 and the composite butterfly spring group 3. On the groove 5, the slope at the lower end of the bevel bushing 4 forms a wedge-shaped fit with the slope at the upper end of the butterfly plate wheel groove 5, and the butterfly plate 7 is installed on the side of the valve stem 8 through the butterfly plate wheel groove 5, and the valve stem 8 is provided with a cam 6. The disc wheel groove 5 and the cam 6 are clearance fit, and the width of the cam 6 is equal to the width of the disc wheel groove 5 .

Description

Reversible rotary structure of butterfly valve disc

technical field

The utility model relates to a sealing structure of a valve, in particular to a butterfly plate reversible rotary structure of a two-way pressure butterfly plate metal hard seal butterfly valve.

Background technique

In the prior art, the movable double-stem butterfly plate hard-sealed butterfly valve has large deformation and cannot form enough friction torque to overcome the fluid hydrodynamic torque.

Contents of the invention

The purpose of the utility model is to make the butterfly plate turn to the closed position when the butterfly plate is in the open position, reduce the deformation of the butterfly valve, and form a large enough frictional moment to overcome the hydrodynamic moment of the fluid.

The reversible rotary structure of the butterfly plate of the butterfly valve, the hand wheel 1 is installed on the upper end of the valve stem 8, the valve stem is installed in the valve body 1' through a bushing assembly, the inclined bushing 4 is composed of a locknut 2, a composite butterfly spring group 3 Fastened on the disc wheel groove 5, the slope at the lower end of the bevel bushing 4 forms a wedge-shaped fit with the slope at the upper end of the butterfly plate wheel groove 5, and the butterfly plate 7 is installed on the side of the valve stem 8 through the butterfly plate wheel groove 5, and the valve The bar 8 is provided with a cam 6, the butterfly plate wheel groove 5 and the cam 6 are clearance fit, and the width of the cam 6 is equal to the width of the butterfly plate wheel groove 5.

The utility model is beneficial in that: in the reversible rotary structure of the butterfly plate of the butterfly valve, the inclined surface of the shaft sleeve and the inclined surface of the wheel groove are arranged, and the friction torque between the inclined surfaces overcomes the hindering effect of the hydrodynamic moment of the fluid on the rotation of the butterfly plate. The 90° reversible rotation of the butterfly plate and the opening and closing of the butterfly valve; the structure is combined with a butterfly spring group, with small deformation and large elastic force, which can form enough friction torque to overcome the fluid hydrodynamic torque.

Description of drawings

Fig. 1 is a structural diagram of the utility model, and Fig. 2 is a schematic diagram of the movement of the butterfly plate.

Detailed ways

As shown in Figure 1, the hand wheel 1 is installed on the upper end of the valve stem 8, the valve stem is installed in the valve body 1' through a bushing assembly, and the inclined bushing 4 is fastened by the locknut 2 and the compound butterfly spring group 3 On the butterfly plate wheel groove 5, the inclined surface at the lower end of the inclined plane bushing 4 forms a wedge-shaped fit with the inclined surface at the upper end of the butterfly plate wheel groove 5, and the butterfly plate 7 is installed on the side of the valve stem 8 through the butterfly plate wheel groove 5, and the valve stem 8 A cam 6 is arranged on it, and the disc wheel groove 5 and the cam 6 are clearance fit. The width of cam 6 equals the width of disc wheel groove 5. Cam 6 is referred to as eccentric circle equal-width cam in the utility model.

As shown in Figure 2, the eccentric circular equal-width cam 6 on the valve stem 8 rotates clockwise to drive the butterfly plate 7 to move from point A to point B. The butterfly plate 7 is separated from the sealing surface of the valve body, and the valve stem 8 rotates to drive the butterfly plate 7. Rotate to point C, the fluid pressure acts on the butterfly plate, because the distance between the fluid pressure action point of the butterfly plate on both sides of the valve stem and the center of rotation is not equal, the fluid pressure has a hydrodynamic moment on the butterfly plate, the eccentric circle equal width cam 6 and the butterfly plate The plate wheel groove 5 is in a clearance fit, and the hydrodynamic moment hinders the rotation of the butterfly plate 7. The butterfly plate 7 moves from point A to point B, and as shown in Figure 1, the slope of the butterfly plate wheel groove 5 exerts pressure on the slope of the slope bushing 4, and the slope of the slope bushing 4 moves upwards to compress the compound butterfly spring group 3 Deformation occurs, when the composite butterfly spring group 3 generates deformation force and reacts on the inclined plane bushing 4 and the inclined surface of the wheel groove of the butterfly plate 7, this reaction produces a frictional moment on the inclined plane bushing 5 and the inclined surface of the wheel groove of the butterfly plate 7 when the valve stem 8 rotates When it is greater than the hydraulic torque of the fluid, the valve rod 8 can drive the butterfly plate 7 to rotate.

As shown in Figure 2, the valve stem 8 rotates around point O, and the eccentric circle equal-width cam 6 on the valve stem 8 rotates clockwise to drive the butterfly plate to move from point A to point B. The butterfly plate 7 is separated from the sealing surface of the valve body, and the valve stem 8 continues to rotate 90°, the butterfly plate 7 moves from point B to point C, and the butterfly valve opens. If the fluid flows from the flow channel of the butterfly valve to the right, the hydrodynamic moment of the fluid drives the butterfly plate 7 to rotate counterclockwise, and the butterfly plate 7 tends to move in the closing direction when it is in the open position. The valve stem 8 drives the butterfly plate 7 to rotate clockwise by 90°, and the butterfly valve is closed. If the medium flows from the flow path of the butterfly valve to the left, the hydrodynamic moment of the medium drives the butterfly plate 7 to rotate clockwise, and the eccentric circle equal-width cam 6 cannot drive the butterfly plate 7 to rotate in the opening direction.

Claims (1)

1. The reversible rotary structure of the butterfly plate of the butterfly valve. The hand wheel (1) is installed on the upper end of the valve stem (8), and the valve stem (8) is installed in the valve body (1′) through a shaft sleeve assembly. It is characterized in that the inclined plane shaft The sleeve (4) is fastened on the disc wheel groove (5) by the locknut (2) and the compound butterfly spring group (3), and the slope at the lower end of the beveled bushing (4) is aligned with the upper end of the disc wheel groove (5). The inclined surface forms a wedge fit, the butterfly plate (7) is installed on the side of the valve stem (8) through the butterfly plate wheel groove (5), the valve stem (8) is provided with a cam (6), and the butterfly plate wheel groove (5) ) and the cam (6) are clearance fit, and the width of the cam (6) is equal to the width of the disc wheel groove (5).

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